/*
    * SPDX-FileCopyrightText: none
    * SPDX-License-Identifier: CC0-1.0
    */
   
   package gov.nist.secauto.metaschema.databind.codegen.config;
   
   import gov.nist.secauto.metaschema.core.model.IAssemblyDefinition;
   import gov.nist.secauto.metaschema.core.model.IFieldDefinition;
  import gov.nist.secauto.metaschema.core.model.IModelDefinition;
  import gov.nist.secauto.metaschema.core.model.IModule;
  import gov.nist.secauto.metaschema.core.util.CollectionUtil;
  import gov.nist.secauto.metaschema.core.util.ObjectUtils;
  import gov.nist.secauto.metaschema.databind.codegen.ClassUtils;
  import gov.nist.secauto.metaschema.databind.codegen.xmlbeans.JavaModelBindingType;
  import gov.nist.secauto.metaschema.databind.codegen.xmlbeans.JavaObjectDefinitionBindingType;
  import gov.nist.secauto.metaschema.databind.codegen.xmlbeans.MetaschemaBindingType;
  import gov.nist.secauto.metaschema.databind.codegen.xmlbeans.MetaschemaBindingsDocument;
  import gov.nist.secauto.metaschema.databind.codegen.xmlbeans.MetaschemaBindingsType;
  import gov.nist.secauto.metaschema.databind.codegen.xmlbeans.ModelBindingType;
  import gov.nist.secauto.metaschema.databind.codegen.xmlbeans.ObjectDefinitionBindingType;
  
  import org.apache.xmlbeans.XmlException;
  
  import java.io.File;
  import java.io.IOException;
  import java.net.MalformedURLException;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.net.URL;
  import java.nio.file.Path;
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.concurrent.ConcurrentHashMap;
  
  import edu.umd.cs.findbugs.annotations.NonNull;
  import edu.umd.cs.findbugs.annotations.Nullable;
  
  public class DefaultBindingConfiguration implements IBindingConfiguration {
    private final Map<String, String> namespaceToPackageNameMap = new ConcurrentHashMap<>();
    // metaschema location -> ModelType -> Definition name -> IBindingConfiguration
    private final Map<String, MetaschemaBindingConfiguration> moduleUrlToMetaschemaBindingConfigurationMap
        = new ConcurrentHashMap<>();
  
    @Override
    public String getPackageNameForModule(IModule module) {
      URI namespace = module.getXmlNamespace();
      return getPackageNameForNamespace(ObjectUtils.notNull(namespace.toASCIIString()));
    }
  
    /**
     * Retrieve the binding configuration for the provided {@code definition}.
     *
     * @param definition
     *          the definition to get the config for
     * @return the binding configuration or {@code null} if there is not
     *         configuration
     */
    @Nullable
    public IDefinitionBindingConfiguration getBindingConfigurationForDefinition(
        @NonNull IModelDefinition definition) {
      String moduleUri = ObjectUtils.notNull(definition.getContainingModule().getLocation().toASCIIString());
      String definitionName = definition.getName();
  
      MetaschemaBindingConfiguration metaschemaConfig = getMetaschemaBindingConfiguration(moduleUri);
  
      IDefinitionBindingConfiguration retval = null;
      if (metaschemaConfig != null) {
        switch (definition.getModelType()) {
        case ASSEMBLY:
          retval = metaschemaConfig.getAssemblyDefinitionBindingConfig(definitionName);
          break;
        case FIELD:
          retval = metaschemaConfig.getFieldDefinitionBindingConfig(definitionName);
          break;
        default:
          throw new UnsupportedOperationException(
              String.format("Unsupported definition type '%s'", definition.getModelType()));
        }
      }
      return retval;
    }
  
    @Override
    public String getQualifiedBaseClassName(IModelDefinition definition) {
      IDefinitionBindingConfiguration config = getBindingConfigurationForDefinition(definition);
      return config == null
          ? null
          : config.getQualifiedBaseClassName();
    }
  
    @Override
    public String getClassName(IModelDefinition definition) {
      IDefinitionBindingConfiguration config = getBindingConfigurationForDefinition(definition);
  
      String retval = null;
      if (config != null) {
        retval = config.getClassName();
     }
 
     if (retval == null) {
       retval = ClassUtils.toClassName(definition.getName());
     }
     return retval;
   }
 
   @Override
   public @NonNull String getClassName(@NonNull IModule module) {
     // TODO: make this configurable
     return ClassUtils.toClassName(module.getShortName() + "Module");
   }
 
   @Override
   public List<String> getQualifiedSuperinterfaceClassNames(IModelDefinition definition) {
     IDefinitionBindingConfiguration config = getBindingConfigurationForDefinition(definition);
     return config == null
         ? CollectionUtil.emptyList()
         : config.getInterfacesToImplement();
   }
 
   /**
    * Binds an XML namespace, which is normally associated with one or more Module,
    * with a provided Java package name.
    *
    * @param namespace
    *          an XML namespace URI
    * @param packageName
    *          the package name to associate with the namespace
    * @throws IllegalStateException
    *           if the binding configuration is changing a previously changed
    *           namespace to package binding
    */
   public void addModelBindingConfig(String namespace, String packageName) {
     if (namespaceToPackageNameMap.containsKey(namespace)) {
       String oldPackageName = namespaceToPackageNameMap.get(namespace);
       if (!oldPackageName.equals(packageName)) {
         throw new IllegalStateException(
             String.format("Attempt to redefine existing package name '%s' to '%s' for namespace '%s'",
                 oldPackageName,
                 packageName,
                 namespace));
       } // else the same package name, so do nothing
     } else {
       namespaceToPackageNameMap.put(namespace, packageName);
     }
   }
 
   /**
    * Based on the current binding configuration, generate a Java package name for
    * the provided namespace. If the namespace is already mapped, such as through
    * the use of {@link #addModelBindingConfig(String, String)}, then the provided
    * package name will be used. If the namespace is not mapped, then the namespace
    * URI will be translated into a Java package name.
    *
    * @param namespace
    *          the namespace to generate a Java package name for
    * @return a Java package name
    */
   @NonNull
   protected String getPackageNameForNamespace(@NonNull String namespace) {
     String packageName = namespaceToPackageNameMap.get(namespace);
     if (packageName == null) {
       packageName = ClassUtils.toPackageName(namespace);
     }
     return packageName;
   }
 
   /**
    * Get the binding configuration for the provided Module.
    *
    * @param module
    *          the Module module
    * @return the configuration for the Module or {@code null} if there is no
    *         configuration
    */
   protected MetaschemaBindingConfiguration getMetaschemaBindingConfiguration(@NonNull IModule module) {
     String moduleUri = ObjectUtils.notNull(module.getLocation().toString());
     return getMetaschemaBindingConfiguration(moduleUri);
 
   }
 
   /**
    * Get the binding configuration for the Module modulke located at the provided
    * {@code moduleUri}.
    *
    * @param moduleUri
    *          the location of the Module module
    * @return the configuration for the Module module or {@code null} if there is
    *         no configuration
    */
   @Nullable
   protected MetaschemaBindingConfiguration getMetaschemaBindingConfiguration(@NonNull String moduleUri) {
     return moduleUrlToMetaschemaBindingConfigurationMap.get(moduleUri);
   }
 
   /**
    * Set the binding configuration for the Module module located at the provided
    * {@code moduleUri}.
    *
    * @param moduleUri
    *          the location of the Module module
    * @param config
    *          the Module binding configuration
    * @return the old configuration for the Module module or {@code null} if there
    *         was no previous configuration
    */
   public MetaschemaBindingConfiguration addMetaschemaBindingConfiguration(
       @NonNull String moduleUri,
       @NonNull MetaschemaBindingConfiguration config) {
     Objects.requireNonNull(moduleUri, "moduleUri");
     Objects.requireNonNull(config, "config");
     return moduleUrlToMetaschemaBindingConfigurationMap.put(moduleUri, config);
   }
 
   /**
    * Load the binding configuration from the provided {@code file}.
    *
    * @param file
    *          the configuration resource
    * @throws IOException
    *           if an error occurred while reading the {@code file}
    */
   public void load(Path file) throws IOException {
     URL resource = file.toAbsolutePath().normalize().toUri().toURL();
     load(resource);
   }
 
   /**
    * Load the binding configuration from the provided {@code file}.
    *
    * @param file
    *          the configuration resource
    * @throws IOException
    *           if an error occurred while reading the {@code file}
    */
   public void load(File file) throws IOException {
     load(file.toPath());
   }
 
   /**
    * Load the binding configuration from the provided {@code resource}.
    *
    * @param resource
    *          the configuration resource
    * @throws IOException
    *           if an error occurred while reading the {@code resource}
    */
   public void load(URL resource) throws IOException {
     MetaschemaBindingsDocument xml;
     try {
       xml = MetaschemaBindingsDocument.Factory.parse(resource);
     } catch (XmlException ex) {
       throw new IOException(ex);
     }
 
     MetaschemaBindingsType bindings = xml.getMetaschemaBindings();
 
     for (ModelBindingType model : bindings.getModelBindingList()) {
       processModelBindingConfig(model);
     }
 
     for (MetaschemaBindingType metaschema : bindings.getMetaschemaBindingList()) {
       try {
         processMetaschemaBindingConfig(resource, metaschema);
       } catch (MalformedURLException | URISyntaxException ex) {
         throw new IOException(ex);
       }
     }
   }
 
   private void processModelBindingConfig(ModelBindingType model) {
     String namespace = model.getNamespace();
 
     if (model.isSetJava()) {
       JavaModelBindingType java = model.getJava();
       if (java.isSetUsePackageName()) {
         addModelBindingConfig(namespace, java.getUsePackageName());
       }
     }
   }
 
   private void processMetaschemaBindingConfig(URL configResource, MetaschemaBindingType metaschema)
       throws MalformedURLException, URISyntaxException {
     String href = metaschema.getHref();
     URL moduleUrl = new URL(configResource, href);
     String moduleUri = ObjectUtils.notNull(moduleUrl.toURI().normalize().toString());
 
     MetaschemaBindingConfiguration metaschemaConfig = getMetaschemaBindingConfiguration(moduleUri);
     if (metaschemaConfig == null) {
       metaschemaConfig = new MetaschemaBindingConfiguration();
       addMetaschemaBindingConfiguration(moduleUri, metaschemaConfig);
     }
     for (ObjectDefinitionBindingType assemblyBinding : metaschema.getDefineAssemblyBindingList()) {
       String name = ObjectUtils.requireNonNull(assemblyBinding.getName());
       IDefinitionBindingConfiguration config = metaschemaConfig.getAssemblyDefinitionBindingConfig(name);
       config = processDefinitionBindingConfiguration(config, assemblyBinding);
       metaschemaConfig.addAssemblyDefinitionBindingConfig(name, config);
     }
 
     for (ObjectDefinitionBindingType fieldBinding : metaschema.getDefineFieldBindingList()) {
       String name = ObjectUtils.requireNonNull(fieldBinding.getName());
       IDefinitionBindingConfiguration config = metaschemaConfig.getFieldDefinitionBindingConfig(name);
       config = processDefinitionBindingConfiguration(config, fieldBinding);
       metaschemaConfig.addFieldDefinitionBindingConfig(name, config);
     }
   }
 
   @NonNull
   private static IMutableDefinitionBindingConfiguration processDefinitionBindingConfiguration(
       @Nullable IDefinitionBindingConfiguration oldConfig,
       @NonNull ObjectDefinitionBindingType objectDefinitionBinding) {
     IMutableDefinitionBindingConfiguration config = oldConfig == null
         ? new DefaultDefinitionBindingConfiguration()
         : new DefaultDefinitionBindingConfiguration(oldConfig);
 
     if (objectDefinitionBinding.isSetJava()) {
       JavaObjectDefinitionBindingType java = objectDefinitionBinding.getJava();
       if (java.isSetUseClassName()) {
         config.setClassName(ObjectUtils.notNull(java.getUseClassName()));
       }
 
       if (java.isSetExtendBaseClass()) {
         config.setQualifiedBaseClassName(ObjectUtils.notNull(java.getExtendBaseClass()));
       }
 
       for (String interfaceName : java.getImplementInterfaceList()) {
         config.addInterfaceToImplement(ObjectUtils.notNull(interfaceName));
       }
     }
     return config;
   }
 
   public static final class MetaschemaBindingConfiguration {
     private final Map<String, IDefinitionBindingConfiguration> assemblyBindingConfigs = new ConcurrentHashMap<>();
     private final Map<String, IDefinitionBindingConfiguration> fieldBindingConfigs = new ConcurrentHashMap<>();
 
     private MetaschemaBindingConfiguration() {
     }
 
     /**
      * Get the binding configuration for the {@link IAssemblyDefinition} with the
      * provided {@code name}.
      *
      * @param name
      *          the definition name
      * @return the definition's binding configuration or {@code null} if no
      *         configuration is provided
      */
     @Nullable
     public IDefinitionBindingConfiguration getAssemblyDefinitionBindingConfig(@NonNull String name) {
       return assemblyBindingConfigs.get(name);
     }
 
     /**
      * Get the binding configuration for the {@link IFieldDefinition} with the
      * provided {@code name}.
      *
      * @param name
      *          the definition name
      * @return the definition's binding configuration or {@code null} if no
      *         configuration is provided
      */
     @Nullable
     public IDefinitionBindingConfiguration getFieldDefinitionBindingConfig(@NonNull String name) {
       return fieldBindingConfigs.get(name);
     }
 
     /**
      * Set the binding configuration for the {@link IAssemblyDefinition} with the
      * provided {@code name}.
      *
      * @param name
      *          the definition name
      * @param config
      *          the new binding configuration for the definition
      * @return the definition's old binding configuration or {@code null} if no
      *         configuration was previously provided
      */
     @Nullable
     public IDefinitionBindingConfiguration addAssemblyDefinitionBindingConfig(@NonNull String name,
         @NonNull IDefinitionBindingConfiguration config) {
       return assemblyBindingConfigs.put(name, config);
     }
 
     /**
      * Set the binding configuration for the {@link IFieldDefinition} with the
      * provided {@code name}.
      *
      * @param name
      *          the definition name
      * @param config
      *          the new binding configuration for the definition
      * @return the definition's old binding configuration or {@code null} if no
      *         configuration was previously provided
      */
     @Nullable
     public IDefinitionBindingConfiguration addFieldDefinitionBindingConfig(@NonNull String name,
         @NonNull IDefinitionBindingConfiguration config) {
       return fieldBindingConfigs.put(name, config);
     }
   }
 }